arch/microblaze/include/asm/cmpxchg.h:19:50: sparse: sparse: cast truncates bits from constant value (deadbeef becomes ef)

arch/microblaze/include/asm/cmpxchg.h:19:50: sparse: sparse: cast truncates bits from constant value (deadbeef becomes ef)

[kernel test robot]

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tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   1df0d8960499e58963fd6c8ac75e544f2b417b29
commit: 80591e61a0f7e88deaada69844e4a31280c4a38f kbuild: tell sparse about the $ARCH
date:   8 months ago
config: microblaze-randconfig-s031-20200711 (attached as .config)
compiler: microblaze-linux-gcc (GCC) 9.3.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # apt-get install sparse
        # sparse version: v0.6.2-37-gc9676a3b-dirty
        git checkout 80591e61a0f7e88deaada69844e4a31280c4a38f
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=microblaze 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>


sparse warnings: (new ones prefixed by >>)

>> arch/microblaze/include/asm/cmpxchg.h:19:50: sparse: sparse: cast truncates bits from constant value (deadbeef becomes ef)
>> arch/microblaze/include/asm/cmpxchg.h:19:50: sparse: sparse: cast truncates bits from constant value (deadbeef becomes ef)
>> arch/microblaze/include/asm/cmpxchg.h:19:50: sparse: sparse: cast truncates bits from constant value (deadbeef becomes ef)
>> arch/microblaze/include/asm/cmpxchg.h:19:50: sparse: sparse: cast truncates bits from constant value (deadbeef becomes ef)
   include/asm-generic/cmpxchg-local.h:30:42: sparse: sparse: cast truncates bits from constant value (deadbeef becomes ef)
   include/asm-generic/cmpxchg-local.h:34:44: sparse: sparse: cast truncates bits from constant value (deadbeef becomes beef)
   include/asm-generic/cmpxchg-local.h:30:42: sparse: sparse: cast truncates bits from constant value (deadbeef becomes ef)
   include/asm-generic/cmpxchg-local.h:34:44: sparse: sparse: cast truncates bits from constant value (deadbeef becomes beef)
   include/asm-generic/cmpxchg-local.h:30:42: sparse: sparse: cast truncates bits from constant value (deadbeef becomes ef)
   include/asm-generic/cmpxchg-local.h:34:44: sparse: sparse: cast truncates bits from constant value (deadbeef becomes beef)
   include/asm-generic/cmpxchg-local.h:30:42: sparse: sparse: cast truncates bits from constant value (deadbeef becomes ef)
   include/asm-generic/cmpxchg-local.h:34:44: sparse: sparse: cast truncates bits from constant value (deadbeef becomes beef)
   include/asm-generic/cmpxchg-local.h:30:42: sparse: sparse: cast truncates bits from constant value (deadbeef becomes ef)
   include/asm-generic/cmpxchg-local.h:34:44: sparse: sparse: cast truncates bits from constant value (deadbeef becomes beef)
   include/asm-generic/cmpxchg-local.h:30:42: sparse: sparse: cast truncates bits from constant value (deadbeef becomes ef)
   include/asm-generic/cmpxchg-local.h:34:44: sparse: sparse: cast truncates bits from constant value (deadbeef becomes beef)
   include/asm-generic/cmpxchg-local.h:30:42: sparse: sparse: cast truncates bits from constant value (deadbeef becomes ef)
   include/asm-generic/cmpxchg-local.h:34:44: sparse: sparse: cast truncates bits from constant value (deadbeef becomes beef)
   include/asm-generic/cmpxchg-local.h:30:42: sparse: sparse: cast truncates bits from constant value (deadbeef becomes ef)
   include/asm-generic/cmpxchg-local.h:34:44: sparse: sparse: cast truncates bits from constant value (deadbeef becomes beef)

vim +19 arch/microblaze/include/asm/cmpxchg.h

c40d04df152a11 David Howells 2012-03-28   8  
c40d04df152a11 David Howells 2012-03-28   9  static inline unsigned long __xchg(unsigned long x, volatile void *ptr,
c40d04df152a11 David Howells 2012-03-28  10  								int size)
c40d04df152a11 David Howells 2012-03-28  11  {
c40d04df152a11 David Howells 2012-03-28  12  	unsigned long ret;
c40d04df152a11 David Howells 2012-03-28  13  	unsigned long flags;
c40d04df152a11 David Howells 2012-03-28  14  
c40d04df152a11 David Howells 2012-03-28  15  	switch (size) {
c40d04df152a11 David Howells 2012-03-28  16  	case 1:
c40d04df152a11 David Howells 2012-03-28  17  		local_irq_save(flags);
c40d04df152a11 David Howells 2012-03-28  18  		ret = *(volatile unsigned char *)ptr;
c40d04df152a11 David Howells 2012-03-28 @19  		*(volatile unsigned char *)ptr = x;
c40d04df152a11 David Howells 2012-03-28  20  		local_irq_restore(flags);
c40d04df152a11 David Howells 2012-03-28  21  		break;
c40d04df152a11 David Howells 2012-03-28  22  
c40d04df152a11 David Howells 2012-03-28  23  	case 4:
c40d04df152a11 David Howells 2012-03-28  24  		local_irq_save(flags);
c40d04df152a11 David Howells 2012-03-28  25  		ret = *(volatile unsigned long *)ptr;
c40d04df152a11 David Howells 2012-03-28  26  		*(volatile unsigned long *)ptr = x;
c40d04df152a11 David Howells 2012-03-28  27  		local_irq_restore(flags);
c40d04df152a11 David Howells 2012-03-28  28  		break;
c40d04df152a11 David Howells 2012-03-28  29  	default:
c40d04df152a11 David Howells 2012-03-28  30  		__bad_xchg(ptr, size), ret = 0;
c40d04df152a11 David Howells 2012-03-28  31  		break;
c40d04df152a11 David Howells 2012-03-28  32  	}
c40d04df152a11 David Howells 2012-03-28  33  
c40d04df152a11 David Howells 2012-03-28  34  	return ret;
c40d04df152a11 David Howells 2012-03-28  35  }
c40d04df152a11 David Howells 2012-03-28  36  

:::::: The code at line 19 was first introduced by commit
:::::: c40d04df152a1111c5bbcb632278394dabd2b73d Disintegrate asm/system.h for Microblaze

:::::: TO: David Howells <dhowells@redhat.com>
:::::: CC: David Howells <dhowells@redhat.com>

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org

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